Material Drying
4 조회수
PA moisture absorption causes continuous dimensional changes during storage, requiring environmental control
문제 현상
PA moisture absorption causes continuous dimensional changes during storage, requiring environmental control
원인 분석
（1）Polyamide (general-purpose nylon) has strong moisture absorption and continuously absorbs moisture in the storage environment and the size increases
（2）The moisture absorption expansion of dry products in a humid environment can reach 0.5-1.5%
（3）Conditioned products will lose moisture and shrink again in a dry environment
（4）The dimensional change is positively correlated with storage time and environmental humidity
（5）PA12 has a low moisture absorption rate and smaller dimensional change, but it still has an impact
해결 방법
（1）Condition the products to equilibrium moisture content before use
（2）Control the storage environment humidity to be stable at 50-60%RH
（3）Seal and package precision products for moisture protection
（4）Reserve expansion allowance according to the 1.5-2.5% moisture absorption rate
（5）Low-moisture-absorption varieties PA12/PA410 have more stable dimensions
핵심 요약
PA storage requires humidity control or moisture conditioning before use
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